Generalize alignment in heap GC functions. Changes template parameters from int to AllocationAlignment.
Generalize alignment in heap GC functions.
Changes template parameters from int to AllocationAlignment.

LOG=N
BUG=v8:4124

Review URL: https://codereview.chromium.org/1152513002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#28587}

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh